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equipment:zeiss-dsm-962:log [2026/04/01 19:33] – ↷ Links adapted because of a move operation 14.244.120.149equipment:zeiss-dsm-962:log [2026/07/18 19:13] (current) – [Day 2026-07-16] rahix
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 ====== Lab Log for the Zeiss DSM "Kevin" ====== ====== Lab Log for the Zeiss DSM "Kevin" ======
 +
 +> //This page is a lab notebook. It documents the work done in the lab and our thoughts, theories, and findings related to it. Everything you read here is work in progress and not final results. We believe it is best to have our lab notes out in the open, because it gives more detailed insight into what worked for us and what didn't. Of course you can also use this page to follow our progress!//
 +
 +==== Day 2026-07-18 (q3k, rahix) ====
 +For reference, this is the current sample configuration in the SEM:
 +
 +{{:equipment:zeiss-dsm-962:2026-07-18_sample-stubs.png?600|}}
 +
 +==== Day 2026-07-16 (q3k, guest) ====
 +Finally replaced the o-ring. In the process, the interlock switch for the top of the column broke. It is jumpered out for now.
 +
 +  * Original switch: [[https://eu.mouser.com/en/ProductDetail/Honeywell/3SX1-T?qs=10P5Hhl%252BD7%2Fotd6%2FZifFJA%3D%3D|Honeywell 3SX1-T]]
 +  * Possible replacement: [[https://www.tme.eu/pl/details/j-7/mikroprzelaczniki-snap-action/omron-electronic-components/|OMRON J-7]]
 +
 +==== Day 2026-07-11 (q3k, rahix) ====
 +Started work on designing a proper enclosure for the OBI.
 +==== Day 2026-07-10 (q3k) ====
 +Continued work on the OBI. Here's a picture acquired through it:
 +
 +{{:equipment:zeiss-dsm-962:2026-07-10-obi-acquisition.png?600|}}
 +
 +==== Day 2026-07-08 (q3k, hugo) ====
 +New tool worked to get the locknut out. O-ring indeed got destroyed; ordered replacements (it's a 6×2mm). In the meantime, sealed it up again and while not pumping down great, we can still get a good enough vacuum for imaging.
 +
 +Installed the beam blanker:
 +
 +{{:equipment:zeiss-dsm-962:2026-07-11_20-06-beam-blanker.png?600|}}
 +
 +It has an SMC connector, will need to get an appropriate cable.
 +
 +==== Day 2026-07-05 (rahix, rob) ====
 +
 +Next attempt at removing the lock nut that's hiding the broken o-ring.
 +
 +During opening of the gun head, we found a washer beneath the liner tube.  It is wrapped inside the aluminum foil labelled //Anode//, next to the anode head.
 +
 +The first iteration of the 3d-printed tool broke, the lock nut is on there really tight.
 +
 +Redesigned the locknut tool to hopefully take more torque.  Printed the new tool, but didn't get to use it yet.  The model is in ''misc/sem-anode-lock-ring-tool.FCStd''. It is designed to take two M2x16 screws for engaging the lock nut.
 +
 +{{:equipment:zeiss-dsm-962:locknut-tool.png?200|}}
 +
 +Roughly reassembled the column (anode head, liner tube, and the washer are still outside). Pulled a rough vacuum to not leave the system under atmosphere.
 +==== Day 2026-07-03 (q3k, hugo) ====
 +
 +Attempted to adjust the anode head to be able to fit the beam blanker. Part which needed to be rotated in purple.
 +
 +{{:equipment:zeiss-dsm-962:anode-head-realignment.png?direct&400|}}
 +
 +[Documentation p. 174, 6.2 02-3 3]
 +
 +This required disassembling the anode head - removing it from the column, which also meant removing the cathode head with its hinge, removing the cathode head interlock switch (soldered on) and disconnecting the beam aligner connector inside the column.
 +
 +The anode part that was misaligned has been realigned by rotating it by 120 degrees.
 +
 +Unfortunately after reassembly the column barely reaches minimum working vacuum. This is likely because of damage to an o-ring in the cathode head. When the head was re-attached, the sharp column tube that was affixed to the rest of the machine damaged the o-ring as it was being squeezed by a lock nut keeping it in place and sealed.
 +
 +{{:equipment:zeiss-dsm-962:anode-head-oring-cross.png?direct&400|}}
 +
 +{{:equipment:zeiss-dsm-962:anode-head-oring-photo.png?direct&400|}}
 +
 +To do this a tool will need to be manufactured to undo the blue nut. Then the correct replacement o-ring will need to be ordered and replaced.
 +
 +==== Day 2026-06-07 (q3k) ====
 +Hooked up the OBI (Open Beam Interface) to the DSM. Voltage on detector is very low (O(200mVpp)) and return time still needs to be implemented. The OBI wants ~5Vpp, so this is too low. Still managed to acquire first images.
 +
 +==== Day 2026-04-09 (q3k, Rob, guest, leah) ====
 +Reconnected cooling system.
 +
 +Replaced vacuum pump with Edwards pump from Wedel haul. Gets to a decent vacuum, but can't tell if there's still a leak in the column or whether it's outgassing after being at atmosphere for a while.
 +
 +While imaging loud 'click' happened, image turned black and there's no filament current. Checking if it's a burned filament or something else.
  
 ==== Day 2026-03-01 (rahix) ==== ==== Day 2026-03-01 (rahix) ====